The spider’s eyes, ______are fixed on a fly, show the creature’s

The spider’s eyes, ______are fixed on a fly, show the creature’s interest in food.
A、that
B、which
C、in which
D、who
【正确答案】：B
【题目解析】：此处由which引导非限制性关系从句。Which指代the spider’s eyes，并在关系从句中做主语，故用which。